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The Driftproof receipt for agent-browser on Claude Sonnet 5.5, dated 2026-10-18, and what it can say.

agent-browser on claude-sonnet-5-5

Run on 2026-10-18, runner 0.22.2, surface claude-cli, verification level TESTED.

Passing

A case separated upward under the band rule. That is a separation detected under the rule, not proof that the skill moved the score.

driftproof badge: passing on claude-sonnet-5-5, 2026-10-18

The two arms

armmeanspread across casescases
with the skill0.954± 0.0283
without the skill0.828± 0.1383

Lift +0.126, ± 0.141. A spread is the sample standard deviation of the per-case means: a descriptive spread with no coverage probability. The verdict above reads each case's two bands, not these aggregates.

The two arms of this receipt drawn as ranges, with the effect floor marked. 0 0.25 0.5 0.75 1 overlapping without the skill 0.828 with the skill 0.954

What was verified

receipt_hash verified when this page was built from receipts/skill-measurements/published/c8c56c2de130627fd5d6503bfa5a20fc5d843efeec93a1ad58c6ff2ed6941d33.json; run.transcripts records retained-local.

Receipt hash: f4bce7c9f27d9cfc6add44c9eb1bd239d2d6c55d8131ff95a432eaa8458c47c6

Check this file yourself

validate shows that this file is unchanged since it was sealed. It does not show who made it or who sealed it.

curl -fsSLO https://raw.githubusercontent.com/driftproofhq/driftproof/main/receipts/skill-measurements/published/c8c56c2de130627fd5d6503bfa5a20fc5d843efeec93a1ad58c6ff2ed6941d33.json

npx driftproof@0.22.4 validate c8c56c2de130627fd5d6503bfa5a20fc5d843efeec93a1ad58c6ff2ed6941d33.json

Embed the badge

[![driftproof](https://driftproofhq.com/r/f4bce7c9f27d9cfc6add44c9eb1bd239d2d6c55d8131ff95a432eaa8458c47c6/badge.svg)](https://driftproofhq.com/r/f4bce7c9f27d9cfc6add44c9eb1bd239d2d6c55d8131ff95a432eaa8458c47c6/)